@article{CMUC_1967_8_4_a9,
     author = {Kolom\'y, Josef},
     title = {On the differentiability of mappings and convex functionals},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {735--752},
     year = {1967},
     volume = {8},
     number = {4},
     mrnumber = {0243348},
     zbl = {0169.18502},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1967_8_4_a9/}
}